<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">{{ message }}</div>
    <input type="button" value="更改名字" @click="changename()">
   
</body>
<script type="module">
  import { createApp } from 'https://unpkg.com/vue@3/dist/vue.esm-browser.js'
  
  createApp({
    setup() {
      return {
        message: 'Hello Vueeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee!'
      }
    }
  }).mount('#app')
</script>
</html>